Build: Add option for building GDK engine
Build: Manually set PHYSFS build options
PHYSFS_BUILD_STATIC / PHYSFS_BUILD_SHARED. Would be nice to hide these
options from the GUI in a future patch.
osx_Socket: Add SocketHandle and incomplete implementation
Socket: Working on X11 sockets
Socket: X11 sockets working, localhost
Socket: X11 sockets/packets working over internet
Remote: Add class describing IP address and port

Also added new typedef UByte, unsigned char
Socket: Now using Remote class to send packet across web
Hard-coded to my IP, will change this to ask for an IP and port later
Socket: Win32 implementation complete.
Utility: Winsock cleanup on PlatformDeinit
Socket: OS X Socket implementation same as X11